This thesis introduces the method to filtrate chinese document based on frequency statistics , the method developed from vector space model can get the correlative degree according to the user ' s interests and the effect is good 本文结合智能搜索系统介绍了一种基于词频统计的文档过滤算法，该算法对传统的向量空间模型法作了改进，能够根据用户的兴趣爱好很好的对文档进行相关度的排序与过滤，取得了较好的效果。
Real estate ' s unique characteristics make it a suitable investment choice under a range of market conditions , and the low correlation with other assets means it offers diversification benefits , which helps reduce portfolio risk 房地产所具有的独一无二的特点使得它成为在一系列市场条件制约下一个合适的投资选择，另外房地产与其他资产相关度低，就意味着房地产投资可提供多样化的收益，有利于降低整体投资组合风险。
Comparing with traditional method , the proposed one not only reduces the complexity of calculation , but also achieves an improvement of correlation between machine and human scores from 0 . 704 to 0 . 795 on a database of 303 persons recorded from spot putonghua shuiping ceshi 与改进前相比，新算法不仅降低了运算量，而且在普通话水平测试的303人现场录音库上，使得机器打分与国家级评测员打分之间的相关度从0 . 704提升到0 . 795 。
3 . advancing a method to calculate weight of document feature item based on bp neural net the key technologies of information retrieval system are the followings : representation of document and user query ; query matching strategy ; correlation calculation of matching result 提出一种基于bp神经网络统计文档特征项权重的方法信息检索系统的核心技术主要包括三个方面的内容：文档与用户查询的表示：查询匹配策略；匹配结果的相关度计算。
The specific physical background of research is : we take the response data calculated from structural finite element analysis dynamical computing model and the test respond data of the actual structure produced under the transient state encourage as the analysis object , reconstruct phase space for this two sequences , construct sequences to vector , then carry out relation degree analysis between the mathematics model and real structure and analyse the accordance at the same time , using this kind of method , have carried out more careful and thorough discussion especially according to complex structure , have analysed applicability and the characteristic of this kind of method , and identified the feasibility of this kind of related analysis method , and have offered a basis differentiating the reliability of the finite element calculation model in structural dynamic analysis and modifying 研究的具体物理背景是：以结构有限元分析动态计算模型所求出的响应与实际结构在瞬态激励下产生的试验响应数据为分析对象，对这两个序列进行重构相空间，即将序列构造成向量，对数学模型与实际结构进行整体相关度分析，分析其间的符合程度。同时，利用这种方法特别针对复杂结构进行了较仔细和深入的探讨，分析了这种方法的特点和适用性，验明了这种相关分析方法的可行性，从而为结构动态分析中有限元计算模型的可靠性判别和修改提供了依据。
Based on this kind of relations between the topological structures and the content distributions we study the web modelling , community identification and some related application problems in detail : first , after some existed characteristics of the web topology are verified , some new characteristics are discovered : the high clustering property in micro - topology ( high average gathering coefficient ) , the obvious mapping relation between the topological struture and the content in micro - level 、 linear irrelevant between the degree distribution of network nodes and the relative degree distribution of contents etc . then after analysis the topology of the complex network and the network modeling , the muti - scale determinism is proposed , especially for the information network a web evolvement model ( prcp model ) that fused the node authority and the node correlation is proposed . the model deduction , evolving learning verification and large scale experiment proof indicate that the model can explain the micro - topology centralizing phenomena , can imitate the mapping relation between the network connecting distribution and network content relative distribution and also can predict the mapping relation between the topology clustering and content clustering 本文在详细观察了web网络的拓扑结构特征以及拓扑结构与内容分布相互关系的基础上,以信息网络的物理连接拓扑结构与节点内容相关度分布之间的相互关系为主线,从网络特征、网络建模、社区分析及相关应用方面问题进行了深入细致地探讨:首先在验证了前人提出的web网络拓扑结构特征基础上,进一步发现了信息网络所具有的一些新特征: 1 )网络微观颗粒度的拓扑结构聚团与内容聚团存在明显的映射关系,具体包括节点之间的物理连边概率与节点之间的内容相关度成指数比例关系、节点形成三角形拓扑结构的概率与节点内容相关紧密程度之间同样具有一种指数比例关系; 2 )网络节点连接度整体分布与节点内容相关度整体分布是线性无关的; 3 )网络微观拓扑结构中的存在很强的集聚性(平均聚团系数很高) 。
Secondly , the article sets forth the development of our listing companies and stock market , and emphasis on the analysis of its systemic defections . such as complicated stock structure , weak fluidity of stock , special structure of corporate governance , weak validity of stock market , unreasonable system of stock issue , low correlation between stock market and economic development , over speculation , poor financing effect of foreign stock generally , and so on . the paper points out these defections have affected the function of equity finance greatly 文中论述了我国上市公司和我国股票市场的发展，重点分析了我国上市公司和股票市场发展中的缺陷，如股权结构复杂、股权流动性差、公司治理结构独特、股票市场有效性较差、股票发行制度不合理、股票市场发展与经济发展相关度低、股票市场分割、过度投机严重、外资股市场融资效果总体较差等。
It has become a tendency to develop specific internet information retrieval tools . the technique of topic - focused web information searching and filtering described in this paper . according to the personality of topic - focused information , we present a new topic - focused method including information query representation , information retrieval and information filtering 本文研究的面向专题的web信息收集与过滤技术是这类工具的核心,围绕专题信息的特点,设计了一套个性化的专题信息查询表现、专题信息查询和专题信息过滤和收集方法,以适应专业用户信息收集的需要,提高信息收集的相关度和收集效率。
It can dynamically determine the structure information need to index according to real query loads and opti mization of index . second , to consider the effects of structural information on result relevance ranking , this dissertation proposes a ranking algorithm that consider both the frequency distribution and structural distribution of keywords in the result , and a dynamic element - oriented method to compute the weight of keywords 第二，为考虑xml数据中的结构信息对查询结果相关度值的影响，本文提出了一种综合考虑关键字频率分布特征和结构分布特征的查询结果相关度算法，以及一种基于节点的关键字权重计算法，取得了更优的检索性能。
It is said that the liquidity risk of the open - end fund in our country has a very high relativity with the liquidity of the stock assert of the open - end fund , which is based on the environment of the investment of the open - end fund in our country , so we can control the liquidity risk of the open - end fund by controlling the liquidity risk of the stock assert 本文就是在这样的背景下展开研究的。本文根据我国开放式基金的实际情况,指出开放式基金的流动性风险与其股票资产组合的流动性风险有着极大的相关度,因此控制了股票资产组合的流动性风险也就控制了开放式基金的流动性风险。
